import type { Duration } from '../../core';
/**
 * Algorithms which can be used by SNS to calculate the delays associated with all of the retry attempts between the first and last retries in the backoff phase.
 */
export declare enum BackoffFunction {
    /**
     * Arithmetic, see {@link https://docs.aws.amazon.com/images/sns/latest/dg/images/backoff-graph.png|this image} for how this function compares to others
     */
    ARITHMETIC = "ARITHMETIC",
    /**
     * Exponential, see {@link https://docs.aws.amazon.com/images/sns/latest/dg/images/backoff-graph.png|this image} for how this function compares to others
     */
    EXPONENTIAL = "EXPONENTIAL",
    /**
     * Geometric, see {@link https://docs.aws.amazon.com/images/sns/latest/dg/images/backoff-graph.png|this image} for how this function compares to others
     */
    GEOMETRIC = "GEOMETRIC",
    /**
     * Linear, see {@link https://docs.aws.amazon.com/images/sns/latest/dg/images/backoff-graph.png|this image} for how this function compares to others
     */
    LINEAR = "LINEAR"
}
/**
 * Options for customising AWS SNS HTTP/S delivery throttling.
 */
export interface ThrottlePolicy {
    /**
     * The maximum number of deliveries per second, per subscription.
     *
     * @default - no throttling
     */
    readonly maxReceivesPerSecond?: number;
}
/**
 * Options for customising aspects of the content sent in AWS SNS HTTP/S requests.
 */
export interface RequestPolicy {
    /**
     * The content type of the notification being sent to HTTP/S endpoints.
     *
     * @default - text/plain; charset=UTF-8
     */
    readonly headerContentType?: string;
}
/**
 * Options for customising the retry policy of the delivery of SNS messages to HTTP/S endpoints.
 */
export interface HealthyRetryPolicy {
    /**
     * The minimum delay for a retry.  Must be at least one second, not exceed `maxDelayTarget`, and correspond to a whole number of seconds.
     *
     * @default - 20 seconds
     */
    readonly minDelayTarget?: Duration;
    /**
     * The maximum delay for a retry.  Must be at least `minDelayTarget` less than 3,600 seconds, and correspond to a whole number of seconds,
     *
     * @default - 20 seconds
     */
    readonly maxDelayTarget?: Duration;
    /**
     * The total number of retries, including immediate, pre-backoff, backoff, and post-backoff retries.  Must be greater than or equal to zero and not exceed 100.
     *
     * @default 3
     */
    readonly numRetries?: number;
    /**
     * The number of retries to be done immediately, with no delay between them.  Must be zero or greater.
     *
     * @default 0
     */
    readonly numNoDelayRetries?: number;
    /**
     * The number of retries in the pre-backoff phase, with the specified minimum delay between them.  Must be zero or greater
     *
     * @default 0
     */
    readonly numMinDelayRetries?: number;
    /**
     * The number of retries in the post-backoff phase, with the maximum delay between them.  Must be zero or greater
     *
     * @default 0
     */
    readonly numMaxDelayRetries?: number;
    /**
     * The model for backoff between retries.
     *
     * @default - linear
     */
    readonly backoffFunction?: BackoffFunction;
}
/**
 * Options for customising the delivery of SNS messages to HTTP/S endpoints.
 */
export interface DeliveryPolicy {
    /**
     * The retry policy of the delivery of SNS messages to HTTP/S endpoints.
     *
     * @default - Amazon SNS attempts up to three retries with a delay between failed attempts set at 20 seconds
     */
    readonly healthyRetryPolicy?: HealthyRetryPolicy;
    /**
     * The throttling policy of the delivery of SNS messages to HTTP/S endpoints.
     *
     * @default - No throttling
     */
    readonly throttlePolicy?: ThrottlePolicy;
    /**
     * The request of the content sent in AWS SNS HTTP/S requests.
     *
     * @default - The content type is set to 'text/plain; charset=UTF-8'
     */
    readonly requestPolicy?: RequestPolicy;
}